Spinning frame drive



Dec. 25, 1934. P. B. RE EVES 1,985,838

SPINNING FRAME DRIVE Filed Sept. 19. 1952 5 Sheets-Sheet 1 5 I INVENTOR.2 PauiB.Ree1/e5,

, ATTORNEYS De. 25, 1934. P. B. REEVES SPINNING FRAME DRIVE Filed Sept19. 1932 3 Sheets-Sheet 2 J0 INVEA TTOR. J1 Baa B. Reel e6,

ATTORNEYS Patented Dec. 25, 1934 h l v UNITEDTSTATES SPINNING FRAMEDRIVE Paul B. Reeves, Columbus, Ind., asslgnor to Reeves Pulley Company,Columbus, Ind., a corporation of Indiana Application September 19, 1932,Serial No. 633,826

19 Claims.

The present application relates to means for driving spinning frames,and more particularly to driving means of suchcharacter that the speedof operation of the spinning frames controlled thereby shall beautomatically varied in accordance with the requirements of the drivenmachines.

A primary object of the invention is to provide driving mechanism for aspinning frame of such character that, as thread is wound onto thebobbins of the spinning frame, the speed of operation of the machinewill be automatically varied, whereby the time required to fill a set ofbobbins shall be reduced; and whereby the nurnber of breaks occurring asthe bobbins are filled; will likewise be reduced A further object of theinvention is to provide mechanism of the type above described whichshall be entirely mechanical in character, and which shall not dependupon variation in speed of the driving motor. Further objects of theinvention will appear as the description proceeds.

To the accomplishment of the above and related objects, my invention maybe embodied in the forms illustrated in the accompanying drawings,attention being called to the fact, however, that the drawings areillustrative only, and that change may be made in the specificconstructions illustrated and described, so long as the scope of theappended claims is not violated.

Fig. 1 is a perspective view of an end of a spinning frame of well knowntype having associated therewith driving mechanism constructed inaccordance with the present invention;

Fig. 2 is a fragmental perspective, taken substantially at right anglesto the right of- Fig. 1, and showing oniy the driving mechanism;

Fig. 3 is a rear view of the mechanism controlling the speed ofoperation of the machine; Fig. 4 is a'fragmental view of a detail, takenupon an enlarged scale, parts being broken away for clarity ofillustration;

Fig. 5 is a side elevation of a modified form of driving mechanism;

Fig. 6 is an end elevation to the plane of Fig. 5; and

Fig. 7 is a plan view of the structure illustrated in Figs. 5 and 6.

Referring more particularly to the drawings, and specifica ly to Figs. 1m4 inclusive, it will taken-at right angles be seen that I haveillustrated a spinning frame indicated generally at 10. In the drawings,the frame isshown operating to effect a warp wind of yarn on thebobbins, and the drive mechanism illustrated is so constructed andarranged as to control the machine properly for performing warp windingoperations, but it will be understood that the broad principlesillustrated and described herein may be applied, through a slightadaptation of the particular construction illustrated, to perform afilling wind operation, or

a combination. filling wind. The spinning frame 10 comprises a frame orskeleton 11 upon which are suitably mounted a plurality of bobbinspindles 12 with which is associated a ring rail 13 carrying a pluralityof travelers 14, one traveler being associated with each bobbin spindle.Yarn is led to each of the bobbin spindles, such yarn being indicated at15.

In accordance with well understood principles of operation, the ringrail 13 is reciprocated, during operation of themachine, in order todistribute the yarn properly over the surface of the bobbins, thereciprocation of the ring rail being effected by a rod or piston 16which is actuated by an arm 1'7 carried by an oscillated shaft 18.

- The whole machine is driven through a main shaft 19, it beingunderstood that said shaft 19- is so associated with the other elementsof the mechanism as to rotate the bobbin spindles 12 and oscillate theshaft 18 at a frequency suitable to effect the desired distribution dfyarn over the surfaces of the bobbins. In the machine illustrated, ofcourse, the ring rail 13 is recip rocated at a frequency such' as tolaythe yarn or thread on the bobbins ina series of layers, each extendingover substantially the whole vertical length of the bobbins, this methodof winding being known as warp winding.

Associated with the spinning frame 10 is the drivingunit comprising abase 20 formed to provide a slideway 21 in which is slidably mounted aplate 22 carrying a motor 23. Said motor 23 is provided with a spindleor shaft 24 which is positioned in parallelism with the shaft 19. Saidshaft 24 carries a pulley 25, which is preferably a V-pulley, and theshaft 19 carries an expansible pulley which consists of the twooppositely facing coned discs 26 and 2'7. The disc '26 is rigidlymountedon the shaft 19, and the disc 27 is mounted thereon for slidingmovement axially of said shaft 19, said disc 27 being urged' toward thedisc 26 by a spring 28 sleeved over the shaft 19 andabutting at one endagainst the disc 27 and 'at its opposite end against a collar 29. In theform of mechanism illustrated in Figs. 1 to 4 inclusive, the outer endof; shaft 19 is carried in a bearing 30 which is supported on an arm orbracket 31 secured to the frame 11 of the spinning frame 10. Anedge-active belt 32 forms a driving connection between the pulley 25 andthe discs 26 and 2'7.

Suitably journalled in the base 20 is a threaded shaft 33, said shafthaving threaded cooperation with a hub 34 formed on or suitably securedto the plate 22. Said shaft 33 may carry at its upper end a hand wheel35 whereby said shaft may be rotated and it will be obvious that, assaid shaft is rotated, the cooperation of the threads of. the shaft 33with the threads of the hub 34 will cause reciprocation of the plate 22in the slideway 21, the shaft 33 being journalled in the base 20 againstaxial movement.

distance between the shafts 24 and 19. Obviously, as the distancebetween said shafts is. increased, the belt 32 will force the disc 2'7to the left, as viewed in Fig. 2, against the tendency of spring 28;thereby reducing the effective diameter of the expansible pulley 26-27to increase the speed at which the shaft 19 is driven.

Upon the shaft 18 there is rigidly mounted an arm 36 provided with aplurality of apertures 37 or the like whereby there may be secured tosaid arm 36 at points differently spaced from the axis of the shaft 18,one end of a link 38. The opposite end of said link 38' is adjustablysecured to an arm 39 which forms a part of ratchet mechanism 40, saidratchet mechanism including a shaft 41, and being of such character thatsaid shaft is rotated upon movement of the arm 39 in one direction, andis unaffected by inovement of the arm 39 in the opposite direcion. r

The shaft 41 carries a bevel gear 42 which meshes with a pinion 43mounted on the shaft 33, said-pinion 43 being held against movementaxially of the shaft 33 but being rotatable with respect to said shaft.

Formed integrally with, or suitably secured to, the pinion 43 is a hub44 provided with teeth .45. Splined on the shaft 33 is a clutch member46 having teeth 47 adapted for engagement with the teeth 45 of the hub44. Said clutch member.

46 is provided with a flange 48 against which abuts one end of a spring49 sleeved over the shaft 33, the opposite end of said-spring 49 bearingagainst a ring 50 supported upon a ball hearing 51. The spring 49 tendsalways to urge the teeth 47 of the clutch member 46 into engagement withthe teeth 45 of the hub 44, thereby connecting the pinion 43 to drivethe shaft 33.

Pivoted on the base 20 at 52 is a lever 53, one arm 54 of which isformed with a yoke portion 55 which straddles the shaft 33 and the hub44 and which bears against the upper surface of the flange 48 of theclutch member 46.

The plate 22 carries a threaded hub 56 in which is adjustably mounted athreaded stop screw 5'7 adapted, when the plate 22 is moved downwardlyin the slideway 21, to engage the arm 54 of the lever 53. There may beprovided a stop element 58 to limit the downward movement of the arm 54of said lever 53, and to limit likewise the down ward movement of theplate 22.

The opposite arm 59 of the lever 53 is suitably apertured to receive oneend of a link 60, said link carrying an adjustable stop 61 whichcooperates with the under surface of said lever arm 59. The upper end62'of the link is suitably secured to a finger 63 carried by a rockerjournalled at 64 in the base'20, Said rocker is provided with a handle65 whereby said rocker may be shifted to lift the link 60, therebylifting the arm 59 of the lever 53.

The plate 22 carries a hub 66 with which is adjustably associated a pin67 so positioned that, when the plate 22 is moved upwardly in theslideway 21, said pin 67 will engage an arm 68 carried by the rocker tocause movement of the rocker to depress the link 60.

It is known that, as the thread or yarn builds up on the bobbins, thetension on the yarn which exists between the travelers and the bobbinsis reduced. It follows that speed of operation can be increased withoutcausing an increase in the amount of breakage, as the yarn is built upon the bobbins.

If the machine is to be driven at a constant main shaft speed, obviouslythat speed must be slow enough throughout the winding of the bobbins sothat breakage will not be unduly high at the beginning of the run whenthe tension is at a maximum. It follows that, during a large part of therun of the machine, the machine is operating at an inefficiently slowspeedthat is, at a speed which is slower than necessary to prevent unduebreakage. In actual practice, in the past, a compromise has beeneffected, and the machines have ordinarily been driven at a speed whichis higher than optimum for starting the wind, but which is lower than isfeasible for the latter portions of the wind. As a result, the operationas a whole has taken a longer time than necessary,-and there has been anunduly large amount of breakage during the early stages 'of the wind.

Furthermore, if a spinning frame is operated at constant speed, wherebythe tension between the travelers and the bobbins varies during thewind, obviously the size and strength of the thread being wound variesduring the wind.

For both of these reasons, then, it is desirable .to maintain an optimumtension between the travelers and the bobbins at all times, and that canbe done only by gradually increasing the speed of rotation of thebobbins as the bobbins are filled. When such a procedure is followed,the machines may be started at a speed lower than that which is used invpractice in the case of constant speed machines, whereby breakage ismaterially reduced; and that speed of operamain shaft 19 will be theproper one to drive the spindles at optimum speed for starting. The

motor 23 is then energized and the shaft 19 is driven from the motorshaft 24 through the v-belt 32.

As the shaft 18 oscillates, the arm 39 is oscillated, and suchoscillation of the arm 39, through .the ratchet mechanism 40, causesstep-by-step rotation of the shaft 41 in a' direction to drive the shaft33 to move the plate 22 downwardly in the slideway 21. Desirably, abrake 69 is associated with the shaft 41 or with the gear 42 to preventthe shaft 41 from overrunning or from returning. As the plate 22 movesdownwardly,

carrying with it the motor 23 and its shaft. 24 and pulley 25, thedistance between the centers of the shafts 24 and 19 is increased. Thebelt 32 being of constant length is thus forced more deeply into thenotch formed between the discs 26 and 27. Such movement of the belt 32causes, by coaction with the coned face of the disc 27, movement of thedisc 27 to the left, as viewed in Fig. 2, against the tendency of thespring 28. Since the belt 32 has been moved more deeply into the notchbetween the discs 26 and 27, the effective diameter of the pulley 26-27is decreased, thereby increasing the speed of rotation of said pulleyand the shaft 19.

As the yarn is built up on the bobbins, the shaft 18 continues tooscillate and, through the above described mechanism, to rotate theshaft 33, whereby the plate 22 is continuingly moved downwardly.Eventually, and just before the optimum high speed of the shaft 19 isreached, the screw 57 comes into contact with the arm 54 of the lever53. As the plate 22 continues to move downwardly to cause the shaft 19to approach and reach optimum speed, the lever 53 is moved in acounterclockwise direction, as viewed in Fig. 3, and said lever, becauseof its engagement with the flange 48, carries with it the clutch member48. At the moment when optimum high speed of the shaft 19 is reached,the continued movement of the lever 53 moves the teeth 47 out ofengagement with the teeth 45, thereby releasing the pinion 43 fromdriving engagement with the shaft 33.

Operation of the frame is then continued at this optimum high speeduntil the bobbins are filled, when the operator will stop the machine bydeenergizing the motor 23.

The operator then removes the filled bobbins from the spinning frame andreplaces them with empty bobbins. He then rotates the handle in acounter clockwise direction, as viewed in Fig. 1, to lift the link 60.As said link 60 is lifted, the abutment 61 comes into engagement withthe lower surface of the arm 59 of lever 53 and, it being understoodthat the finger 63 is so positioned as to cause the link 60 to operateas a toggle, it will be seen that the lever 53 will be held by said linkand finger in a position such as to prevent engagement of the teeth 47with the teeth 45. The operator now rotates the hand wheel 35 to elevatethe plate 22 to starting position. As the plate 22 is moved upwardly,and the shaft 24 approaches the shaft 19, the spring 28 will cause thedisc 27 to move back toward the disc 26 to starting position, the belt32 being thereby moved outwardly in the notch between the discs 26 and27. As the plate 22 approaches starting position, the pin 67 will engagethe arm 68 to return the rocker to normal position, whereby the link 60is moved downwardly to release the lever 53. The spring49 thus ispermitted to lift the clutch member 46- to bring the teeth 47 intomeshing engagement with the teeth 45 of the hub 44. The mechanism is nowready to begin another operating cycle.

The embodiment of the present invention illustrated in Figs. 5, 6, and 7is quite similar tofastening ,means. Said base is formed to provide aslideway in which is slidably mounted a plate 77. A screw shaft 78 isjournalled in said base 75 and has threaded engagement with a hub 79carried upon the plate 77, said screw shaft carrying a hand wheel 80 atits upper end.

Rotatably mounted upon the shaft 78 is an overrunning clutch which maytake the form of a ratchet or any other desired one-way clutchconstruction. Since the details of this clutch are not important to thepresent invention, I have illustrated simply an outer member 81 and aninner member 82, both of said memb s being rotatably mounted on theshaft 78, d said inner member 82 being formed with teeth for cooperationwith the teeth of a dental clutch member 83 splined on the shaft 78 andurged into engagement with the element 82 by a spring 84. r

The outer element 81 of the one-way clutch carries an arm 85 formed witha longitudinally extending slot 86, one end of a link 87 beingadjustably secured in said slot 86. The opposite end of said link 87 isadjustably secured in the slot 89 of an arm 88 carried by a hub 90secured to the upper end of a shaft 91 suitably journalled in the base75. At its lower end, the shaft 91 has secured thereto a second hub 94having an arm 92 formed with a slot 93 in which is adjustably securedone end of a link 95, the opposite end of which is connected to an arm96 mounted upon the shaft 18, said arm being provided with a pluralityof apertures 97 whereby said link may be adjustably connected thereto.

Pivoted at 98 at a point above the top of the base 75 is a lever, onearm 99 of which has pivotally connected thereto a rod 100 slidablyassociated with a hub 101 carried by the plate 77, said rod carrying anadjustable abutment 102 adjacent its lower end.

The opposite arm 103 of said lever is apertured to receive one end of atoggle link 104, the opposite end of which is secured -to a finger 105on a rocker journalled in a hub projecting upwardly from the base 75.Said rocker is provided with a handle 106 and with an arm 107 forcooperation with a pin 108 adjustably carried in a hub 109 mounted uponthe plate 77.

The base 75 carries an arm or bracket 110 which supports a bearing forthe outer end of the main shaft 19 of the spinning frame. Said shaft 19carries a pair of oppositely facing cone discs 113 and 114, the disc 114being mounted upon said shaft for axial movement thereon and being urgedtoward the disc 113 by a spring 115 abutting said disc and a collar 116mounted upon said shaft. 1

The plate 77 carries a motor 117 upon the spindle of which is mounted aV-pulley drivingly connected to the discs 113 and 114 by' a v-belt 119.

The operation of this embodiment is very Sim-- ilar to that describedhereinbefore. As the plate 77 is moved downwardly, the hub 101 engagesthe abutment 102 to move the clutch member 83 out of engagement with themember 82. when the handle 106 is operated to elevate the lever arm 103,the lever arm 99 is held in position to hold the clutchmember 83 out ofengagement with the member 82. As the plate 77 is moved upwardly bymanual operation of the hand wheel 80, the pin 108 engages the arm 107to release the lever arm 103, whereby the spring 84 is permitted toreturn the clutch member 83 to engagement with the clutch member 82.

bracket 110;

The embodiment illustrated in Figs. 5, 6, and 'I has advantages overthat illustrated in Figs. 1 to 4 in that removal and replacement of thebelt 119 is facilitated, since the speed changing mechanism is removedfrom its substantial alignment with the shaft 19, whereby removal of thedisc 114 fromthe shaft 19 is made practicable. Furthermore, thearrangement and configuration of the bracket 110 makes possible the useof the comparatively short shaft 19, and clears space which is occupiedwhere the structures of Figs. 1 to 4 inclusive are used. When it isdesired to move the belt 119 from the pulley 118, the bolts '76 may beremoved, and the base '75 may be pivoted as a whole about its lowerrighthand corner,

as viewed in Fig. 6, it being understood that the bearing block 111 isfirst disconnected from the Such movement of the base, of course, shiftsthe pulley 118 away from the spinning frame 10, and permits readyremoval of the belt 119 from said pulley.

I claim as my invention:

1. In combination with a spinning frame including a bobbin spindle, aring rail associated therewith, an oscillating shaft for reciprocatingsaid ring rail, and a main shaft associated with said spindle and withsaid oscillating shaft to drive the same, means for driving said mainshaft at variable speed, said means including a driving shaft parallelwith said main shaft, an expansible pulley on one of said'shafts and apulley on the other of said shafts, means for shifting said drivingshaft with respect to said main shaft in a direction transverse to theaxis of said driving shaft means operatively connecting said pulleys,and means including a one-way driving connection between saidoscillating shaft and said shaft-shifting means.

2, In combination with a spinning frame including a bobbin spindle, aring" rail associated therewith, and a main shaft arranged to drive saidspindle and ring rail, a prime mover, variable-speed transmission meansconnecting said prime mover to drive said main shaft, said transmissionmeans including an element movable to vary the speed ratio between saidprime mover and said main shaft, means driven by said main shaft andnormally operable to shift said movable element, during operation ofsaid main shaft, .and automatic means for rendering said lastmentionedmeans ineffective to shift said movable element.

3. In combination with a spinning frame including a bobbin spindle, aring rail associated therewith, and a main shaft arranged to drive saidspindle and ring rail, a prime mover, variable-speed transmission meansconnecting said prime mover to drive said main shaft, said transmissionmeans including an element movable to vary the speed ratio between saidprime mover and said main shaft, means driven by said main shaft forshifting said movable element, clutch means interposed between saidlast-named means and said movable element, and means operable upon apredetermined degree of advancement of said movable-element to disengagesaid clutch means.

4. The combination with a spinning frame having a main shaft, of meansfor driving said main shaft comprising, a base, a motor slidably mountedon said base and having a shaft parallel with said main shaft, pulleyscarried by said shafts and connected by a driving belt, one of saidpulleys being expansible, whereby movement of said motor on said basewill vary the effective diameter of said expansible pulley, means formoving said motor on said base, and, means operatively connecting saidmain shaft to actuate said motor moving means.

5. Variable-speed driving mechanism comprising a base, a motor mountedon said base for sliding movement with respect thereto and havirfg ashaft, a second shaft parallel" with said motor shaft, pulleys carriedby said shafts and connected by a driving belt, one of said pulleysbeing expansible, whereby movement of said motor with respect to saidsecond shaft will vary the effective diameter of said expansible pulley,threaded means journalled in said base and cooperating with said motorto shift the latter on said base, and means connecting said second shaftto drive said threaded means.

6. Variable-speed driving mechanism comprising a base, a motor mountedon said base for sliding movement with respect thereto and having ashaft, a second shaft parallel with said motor shaft, pulleys carriedby' said shafts and connected by a driving belt, one of said pulleysbeing expansible, whereby movement of said motor with respect to saidsecond shaft will vary the effective diameter of said expansible pulley,

. threaded means journalled in said base and co- 7. Variable-speeddriving mechanism comprising a base, a motor mounted on said base forsliding movement with respect thereto and having a shaft, a second shaftparallel with said motor shaft, pulleys carried by said. shafts andconnected by a driving belt, one of said pulleys being expansible,whereby movement of said motor with respect to said second shaft willvary the effective diameter of said expansible pulley, threaded meansjournalled insaid base and cooperating with said motor to shift thelatter on said base, an oscillating element driven by said second shaft,means including a one-way clutch and a twoway clutch connecting saidoscillating element to drive said threaded means, and means operable,upon a predetermined extent of movement of said motor, to disengage saidtwo-way clutch.

8. In combination, a base providing a slide-.

way, a plate slidably mounted in said slideway, a threaded shaftjournalled in said base and having its axis parallel to the axis of saidslideway, said shaft threadedly engaging said plate, means including atwo-way clutch for driving said shaft, and means associated with saidplate and operable, upon movement of said plate beyond a predeterminedposition, to disengage said clutch.

9. In-combination, a base providing a slideway, a. plate slidablymounted in said slideway, a threaded shaft journalled in said base andhaving its axis parallel to the axis of said slideway, said shaftthreadedly engaging said plate, a gear journalled on said shaft, drivingmeans constantly meshed with said gear, a clutch element splined on saidshaft and engageable with said gear to clutch the same to said shaft,and means associated with said plate and operable, upon movement of saidplate beyond a predetermined position, to disengage said clutch elementfrom said ear.

10. In combination, a base providing a slideway, a plate slidablymounted in said slideway, a threaded shaft journalled in said base andhaving its axis parallel to the axis of said slideway,

said shaft threadedly engaging said plate, a gear journalled on saidshaft, driving means constantly meshed with said gear, a clutch elementsplined on said shaft and engageable with said gear to clutch the sameto said shaft, resilient means urging said clutch element into clutchingengagement with said gear, means associated with said plate andautomatically operable, upon move: ment of said plate in one directionbeyond a pre-' determined point, to disengage said clutch element fromsaid gear against the tendency of said resilient means, manuallyactuated means operable to hold said clutch element against the tendencyof said resilient means, and means associated with said. plate andautomatically operable, upon movement of said plate in the oppositedirection beyond a predetermined point, to shift said gear, a leverpivoted on said base, one arm of said lever engaging said clutchelement, means associated with said plate and engageable with,

said lever. arm, upon movement of said plate in one direction beyond apredetermined position, to disengage said clutch element from said gear,

a rocker journalled in said base, a toggle link connecting the oppositearm of said lever with said rocker, and means associated with said plateand engageable with said rocker, upon movement of said plate in theother direction beyond a predetermined point, to release said lever andsaid clutch element.

12. The combination with a spinningframe having a main shaft, of avariable-speed driving attachment therefor comprising a base, a motormounted on'said base and having a shaft parallel with said main shaft,said motor being shiftable on said base in a direction transverse to theaxis of its shaft, pulleys mounted on said shafts and connected by adriving belt, one of said pulleys being expansible, means connectingsaid main shaft to shift said motor, said belt and said last-named meansconstituting the only connection between said spinning frame and saidattachment.

13. The combination'with a spinning frame having a main shaft, of avariable-speed driving attachment therefor comprising a base providing aslideway and anchored on and secured to an element of said spinningframe, an arm secured to said base and providing a bearing for said mainshaft, a motor mounted in said slideway and having a shaft parallel withsaid main shaft, pulleys mounted on said shafts and connected by adriving belt, one of said pulleys being expansible, and means connectingsaid main shaft to shift said motor.

14. In combination a base providing a slideway, a plate slidably mountedin said aslideway, a threaded shaft journalled in said base and havingits axis parallel to the axis of said slideway, said shaft threadedlyengaging said plate; and means for driving said shaft, including aone-way clutch, both elements of said clutch being free to rotate .onsaid shaft, means for driving one element of threaded shaft journalledin said base and having 1 its axis parallel to the axis of saidslideway, said shaft threadedly engaging said plate; and means fordriving said shaft, including a one-way clutch, both elements of saidclutch being free to rotate on said shaft, means for driving one elementof said one-way clutch, and a two-way clutch comprising the otherelement of said one-way clutch and an element splined on said shaft, allof said elements'being positioned above said base, a lever pivoted at apoint above said base and having one "arm operatively associated withsaid'splined element, resilient means urging said splined element towardclutching engagement with its complementary element, an apertured lugcarried by said plate, and a rod connected to said lever arm andslidably received in the aperture of said its axis parallel to the axisof said slideway, said shaft threadedly engaging said plate; and meansfor driving said shaft, including a one-way clutch, both elements ofsaid clutch being free to rotate on said shaft, means for driving oneelement of said one-way clutch, and a. two-way clutch comprising theother element of said one-way clutch and an element splined on saidshaft, all of said elements being positioned above said base, a leverpivoted at a point above said base and having one arm operativelyassociated with said splined element, resilient means urging saidsplined element toward clutching engagement with its complementaryelement, an apertured lug carried by said plate, a rod connected to saidlever arm and slidably received in the aperture of said lug, said rodhaving a stop thereon, a rocker mounted above said base, a toggle linkconnecting said rocker with the opposite arm of said lever, and anelement carried by said plate and engageable with said rocker to releasesaid lever from domination by said toggle link.

f 17. In combination, a base, a carriage slidable on said base, a motormounted on said carriage and having a shaft, a driven shaft, pulleys onsaid shafts, one of said pulleys being expansible, and a belt providinga driving connection between said pulleys, an element movable to shiftsaid carriage.

on said base, and means for controlling said element, comprising anoscillatory shaft, means connecting said driven shaft to oscillate saidoscillatory shaft, one-way drive mechanism connecting and having a.shaft, a driven shaft, pulleys on said shafts, one of said pulleys beingexpansible, and a belt providing a driving connection between saidpulleys, an element movable to shift said carriage ment, comprising anoscillatory shaft, means connecting said driven shaft to oscillate saidoscillatory shaft, means including a clutch connecting said oscillatoryshaft to move said element step by step in one direction, andmeans-automatically operable, at a predetermined point in the cycle ofoperation of the organization to disengage said clutch, therebyrendering said oscillatory shaft ineffective to move said element.

19. In combination, a base, a carriage slidable on said base, a motormounted on said carriage and having a shaft, a. driven shaft, pulleys onsaid shafts, one of said pulleys being expansible, and

on said base, and means for controlling said elea belt providing adriving connection between said pulleys, an element movable to shiftsaid carriage on said base, and means for controlling said element,comprising an oscillatory shaft, means connecting said driven shaft tooscillate said ascillatory shaft, means including a clutch connectingsaid oscillatory shaft to move said element step by step in onedirection, and means carried by said carriage and automaticallyoperable, upon movement of said carriage to a predetermined degree, todisengage said clutch, thereby rendering said oscillatory shaftinefiective to move said element.

- PAUL B. REEVES.

